Improvement in magneto-electric machines



T. A. EDISON. Magneto-Electric. Machine.

No. 222,881. Patented Dec. 23,1879.

jowmwz UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, OF MENLO PARK, NEIV JERSEY.

IMPROVEMENT IN MAGNETO-ELECTRIC MACHINES.

Specification forming part of Letters Patent No. 222,881, dated December 23, 1879; application filed September 10, 1879.

To all whom it may concern:

Be it known that I, THOMAS A. EDIsoN, of Menlo Park, in the State of New Jersey, have invented an Improvementin MagnetoElectric Machines, (Case 184,) of which the following is a specification.

The object of this invention is to increase the effectiveness and cheapen the construction of the revoly'ing armature.

I make the revolving armature of a cylinder of wood with two iron heads, and around the cylinder and between the heads fine iron wire is wound.

At the ends of the cylinder, outside the iron heads, there are disks of hard rubber or other insulating material, and the wires forming the induction-helix are wound lengthwise of the cylinder into notches in the edges of the disk. This insures the proper insulation of the induction-helix, even if the insulating covering of the wires may be injured, and the fine iron-wire cylinder forms a magnet by induction from the field-of-foree magnet, and the wires running eircumferentially also set up magnetic poles in the revolving armature, and with the aid of the commutator the magnetic poles always remain at the right place on account of the quick discharging time of the iron-wire magnet, and therefore are practically regardless of the speed of revolution, andrender it unnecessary to adjust the com mutators for different speeds of revolution.

In the drawings, Figure 1 is an elevation of the tield-of-foree magnet with the poles and armature-cylinder in section. Fig. 2 is a plan of the armattire-cylinder with the poles in section. Fig. 3 represents the wooden cylinder sectionally without the wire helix. Fig. at is a section of one end of the armattire-cylinder, and Fig. 5 is a diagram of the circuit-connections.

The field-of-force magnet to is provided with the poles N S, and the same may be either a permanent magnet or eleetromagnet, but preferably the latter, and the helix thereof in the circuit from the armature-helix; or it may be energized separately. The pole-faces are concave.

The shaft 0 is in bearings d, and has awooden cylinder, 6, between the two iron heads f, and g is the helix of iron wire wound into the space between the heads f.

The insulatingheads h. of hard rubber, vulcanized fiber,orequivalent material, are secured outside the headsf, and are of larger diameter, so that the helix-wires t, that are wound loi'lgitudinally, may be kept from contact with the iron helix 9 or heads f, so that the current may not be short-circuited, even if the insulation of the wires t is defective.

The projections 0 around the heads h serve as guides to retain the wires that are wound into the notches between said projections.

The longitudinal wires 1' are connected to the commutator-plates n, from which the brushes pass the current to the bindingscrews, and thence to the object that is to be supplied with the electric current.

The wires '6 maybe wound in the manner set forth in my application No. 177.

In use the poles N S of the field-magnet energize, by induction, the iron-wire helix 9, and the wires of the armature-coil t are carried across or cut the lines of magnetism, so as to obtain a maximum effect in setting up a current in said induction-helix.

The bobbin, after winding, is served with German-silver wire in several places to keep the inductiouwires against the cylinder.

I do not claim a dynamo-magneto-electric machine wherein a cylindrical armature coiled with insulated wire wound longitudinally on the exterior thereof and provided with a commutator is caused to rotate between curved branches of eleetro-magnets, the coils of which are in electric circuit from the commutator to the terminals of the machine, as I prefer not to include the helix of the field-magnet in the circuit from the commutator.

I claim as my invention The cylinder 0, of wood or similar material, with the iron headsfand intervening helix of fine iron wire, in combination with the disks hofnon-conducting mater al and the induction helix '6, wound length i e and into notches in the edges of the insulating-disks, substantially as set forth.

Signed by me this 4th day of September, A. 111879.

THOS. A. EDISON.

W'itnesses:

S. L. GRIFFIN, FRANK MOLAUGHLIN. 

